Dental plugger.



No. 832,955. PATENTEDAOCT. 9; 1906. H. D. BULTMAN. DENTAL PLUGGER. APPLICATION FILED MAY 9. 1904.

a z Y 1 M 8 f 5H 4T. 7 al 2&4 .1 m ,In n Jl l w MMM 3 1HE Naaars PETERS co., wAsHrNaroN, D. c4

UNITED sTATEs PATENT oEEIoE.

HENRY D. BULTMAN, OF NEW YORK,`N. Y., ASSIGNOR TO CONSOLIDATED DENTAL MANUFACTURING COMPANY, OF NEW YORK, N. Y., A OOR- DENTAL PLUGGER.

Specification of Letters Patent.

Patented Oct. 9, 1906.

Application filed May 9,1904. Serial No 207,049.

To all whom it may con/cern:

Be it known that I, HENRY D. BULTMAN, a citizen of the United States, and a resident of the borough of Brooklyn, in the city and State of New York, have invented a new and useful Improvement in Dental Pluggers, of which the following is a specification.

My invention has for its objects to provide `certain improvements in the construction,

forni, and arrangement of the several parts of a hand-operated dental plugger of that class in which a hammer is caused to deliver a blow upon the tool-h older when the handle is moved a sufficient distance longitudinally with respect to the tool-holder by pressing the tool against a filling or other point intended to receive the blow.

A practical embodiment of my invention is represented in the accompanying drawings, in which- Figure l represents the plugger in a nearly complete longitudinal central section with the parts in the position which they assume as the hammer delivers the blow. Fig. 2 is a similar view with the parts in the position which they assume as the hammer is about to be released for delivering the blow, the spring-adjusting plate being shown in full lines. Fig. 3 is a detail sectional view through a portion of the plugger in a longitudinal direction at right angles to the sections shown in Figs. 1 and 2, the hammer and its adjacent parts being shown in full lines. Fig. 4 is a transverse section in the plane of the line A A of Fig. 3 looking in the direction of the` arrows. Fig. 5 is a transverse section taken in the plane of the line B B of Fig. 1 looking in the direction of the arrows. Fig. 6 is a partial longitudinal central section through a modified form of plugger, and Fig. 7 is a plan view of the retaining-disk of the upper head.

Proceeding to describe the form shown in Figs. 1 to 5, inclusive, the tubular casing is denoted by l. lts lower end is provided with a short screw-threaded portion 2 for the attachment of the lower head 3. The bore of the casing 1 is screw -threaded from its upper end to a point about half-way toward its lower end', as shown at 4. A collar 5* is screwed into the top of the casing, within which collar the upper head 5 is free to rotate. The head 5 has a socket 23, leading upwardly from its bottom, which socket is partially closed by a disk 23*, screwed or otherwise fastened to the bottom of the head 5. The periphery of the disk 23* projects over the bottom of the collar 5* and serves to hold the head in position. provided with a hole 23**, Fig. 7, therethrough, within which the shank 22* of a plate 22** is fitted to have an interlocking sliding engagement. This plate' 22** engages the screw-threaded ortion 4 ofthe casing, so that as the head 5 1s rotated inthe one or the other direction the plate will be moved up or down to decrease or increase the tension of the hammer-operating spring 22. A centrally-arranged tubular tripper-rod 6 has a free sliding movement through the upper head 5 and spring-adjusting plate 22* and is provided near its lower end with a block 7, having a screw-threaded engagement with the inner wall of the casing 1, whereby the rod may be adjusted longitudinally. The lower end of this rod is beveled, as shown at S, for the purpose of tripping the hammercatch, as will hereinafter appear. The toolholder rod is denoted by9, and it extends centrally through the heads 3 and 5, passing through the bore of the tubular tripping-rod 6. The lower end of this tool-holder rod 9 is provided with a socket 10 for the reception of a tool for that class of work in which a pressure of the plugger upon the filling is required. This rod 9 is also provided at its upper end with a tool-holding socket 11 for the reception of a tool for use in that class of work where a pull must be exerted on the plugger to obtain the desired result. concentric with the rod 9, is formevd in the lower end of the head 3, the mouth of which socket is closed by a tip 13, having a screwthreaded engagement with the wall of the socket. The rod 9 is provided with a collar 14 within the socket 12, between which collar and the base of the socket a coil-spring 15 is interposed, tending to return the handle to its normal position on the tool-holder. per end of the lower head 3 is provided with a socket 16, concentric with the rod 9, within which socket l provide an anvil 17, fixed to A socket 12,

This disk 23* is further The up- I IOO the rod for the purpose of receiving the blows from the hammer. The hammer (denoted by 18) surrounds the rod 9 and is permitted a free sliding movement thereony and within the casing and is provided with a framework comprising a disk 19, rigidly connected with the body of the hammer by two arms 20 and 21. This disk 19 is fitted to slide freely on the periphery of the tripping-rod 6, the periphery of the disk being spaced from the screw-threaded interior 4 of the casing. This disk 19 serves as a guide for the lower end of the tripping-rod, and the block 7, which is iXed to the lower end of the tripping-rod, is interposed between the disk 19 and the top of the body portion of the hammer. The spring 22 is interposed between adjustingplate 22m on the upper head 5 and the disk 19 of the hammer. The hammer 18 is locked to and released from the tool-holder rod as follows: The tool-holder rod is provided with a peripheral groove 24 in that portion of the rod between the beveled lower end 8 of the tripper-rod 6 and the top of the body portion of the hammer. This groove is so formed as to provide an abrupt shoulder 25. A springcatch 26 is secured within a radial groove 27 in the body portion of the hammer, the head of which catch is fitted to engage the shoulder 2,5 of the groove 24 in the rod for locking the4 hammer to the rod. The head of the catch 26 projects beyond the periphery of the rod, and as the casing, with its attached parts, is depressed, as shown in Fig. 2, the beveled end 8 of the tripper-rod 6 will engage the head of the catch 26 and force it out of its locking engagement with the tool-holder rod 9. This will permit the hammer to be forced down by the spring 22 until it strikes the anvil 17, carried bythe tool-holder rod, and thus impart a blow to the tool. As the casing is brought back to its normal position under the influence of the spring 15 the hammerv will be raised, because of its engagement with the upper end of the head 3, until the catch 26 is caused to again interlock with the toolholder rod. It will be seen that the point at which the hammer may be tripped is adjusted to the utmost nicety by the adjustment of the tripper-rod 6 to bring its beveled face 8 in position to release the spring at the predetermined point in the downward movement of the casing. It will also be seen that the tension of the spring 22 may be adjusted by the rotary movement of the head 5 and the tension of the spring 15 may be adjusted by the adjustment of the tip 13.

In Fi 6 I have shown a modified form in which t e plugger is adapted only for the direct-thrust tool. In this form the toolholder rod does not extend through the tripper-rod, and the abutment 25 for the catch 26 is formed on the top of the tool-holder rod.

In this form the head is en aged with the screw-threaded portion 4 of t e casing, thus doin away with the adjusting-plate 22W".

W at I claim isl. In combination, a casing, a tool-holder rod, an anvil thereon, a spring-actuated hammer, a catch carried thereby for locking the hammer to the rod, and a centrally-arranged tripper fitted to engage the catch to release the hammer.

2, In combination, a casing, a tool-holder rod, an anvil thereon, a spring-actuated hammer, a catch carried thereby for locking the hammer to the rod and a centrally-arranged adjustable tripper fitted to engage the catch to release the hammer.

3. In combination, a casing, a tool-holder rod, an anvil thereon, a spring-actuated hammer, a catch carried thereby for locking the hammer to the rod and a tubular tripperrod surrounding the tool-holder rod and arranged to engage the catch to release the hammer.

4. In combination, a casing, a tool-holder rod, an anvil thereon, a spring-actuated hammer, a catch carried thereby for locking the hammer to the rod', and an adjustable tubular tripper-rod surrounding the toolholder rod and arranged to engage the catch to release the hammer.

5. In combination, a casing, upper and lower heads, a tool-holder rod, an anvil thereon, a hammer having a disk spaced therefrom, a spring interposed between the upper head and disk, a latch carried by the hammer for locking the hammer to the rod and a tripper-rod extending into the space between the disk and hammer for engaging the catch to release the hammer from the tool-holder rod.

6. In combination, a casing, upper and lower heads, a tool-holder rod, an anvil thereon, a hammer having a disk spaced IOO therefrom, a spring interposed between the upper head and disk, a latch carried by the.

hammer for locking the hammer to the rod, an adjustable tripper-rod concentric with-the tool-holder rod, a block fixed to the trip errod between the disk and hammer, said b ock having a screw-threaded engagement with the casing for adjusting the tripper-rod, said tripper-rod being arranged to engage the catch to release the hammer from the toolholder rod when the casing has been moved a predetermined distance along the toolholder rod.

7. In combination, a casing, upper and lower heads, a tool-holder rod extending longitudinally therethrough, an anvil on the rod, a hammer having a disk s aced therefrom, a catch carried by the ammer arranged to interlock with the rod in the space between the disk and hammer and a tubular IIO tripper-rod surrounding the tool-holder rod 5 my invention I have signed my name, in

extending into the space between the disk l presence of tWo Witnesses, this 29th day of and hammer for en aging the catch to release April 1904.

the hammer Whent e easing has been moved g HENRY D. BULTMAN. 5 the required distance along the tool-holder Witnesses: r rod. FREDK. HAYNEs,

In testimony that I claim the foregoing as C. S. SUNDGREN. 

